James henderson



UNITED STATES PATENT OFFICE.

JAMES HENnEEsoN, OF BELLEEONTE, PENNSYLVANIA, ASSIGNOR To CHARLES e. FRANQKLYN, on NEW YORK,'N. Y.

CO MPOUND FOR FURNACE-LININGS AND FIRE-BRICK.

SPECIFICATION forming part of Letters Patent No. 265,070, dated September 26, 1882,

Application filed August 17, 1882.

To all whom it may concern Be it known that I, JAMESHENDERSON, of

Bellefonte, county of Centre, State of Pennsylvania, (formerly of New York city,) have made a new and useful invention of a Oom pound for Furnace-Linings and Fire-Brick, of which the following is such full, clear,and exact description as will enable others skilled in the art to make and use the same.v

My invention relates to a compound of silica or sand, magnesia, and water for making iurnace-linings or fire-brick.

1n carrying out this invention 1 use the purer qualities of sea-sand, pulverized sandstonesuch as is used in the manufacture of; glass-or washed river-sandsuch as is used for lining the hearths of furnaces used for heating iron, which is practically free of oxide ofironor other substances thatwill form fusible compounds with the sand and magnesia at high temperatures. The sand or silica is preferably reduced to the fineness of flour, or so that it will pass through a sieve of about three thousand six hundred meshes to the square inch. The magnesia is also used in the form offlour, which is produced by calcining carbonate of magnesia to expel the carbonic acid, slaking or hydrating it with water, and drying and re uucing it to flour. This is added to the silica or sand in the proportion of about five (5) per cent. of magnesia, by weight. The magnesia and silica may be mixed together in the dry state, and water enough added to make a thick mortar; or the magnesia may be mixed with water to the consistency of milk of mag- (No specimens.)

nesia and mixed with the sand, either way being productive of good results. 1

The compound thus produced maybe applied to the bottoms and sides of reverberatory fur na'ces or as a lining to other metallurgic ves sels, and dried by the atmosphere, when it is ready for use; or it may be molded into bricks, which are ready for use when dried,or,if preferred, may be burned in kilns. Linings and bricks thus made are hard and refractory, and neither expand nor contract at high temperatures.

I do not wish to be understood as limiting myself to the proportions of magnesia hereinbet'ore given, as good results may be obtained when up to fifteen (15) per cent. is used, or-

less, (to one per cent.) of the compound may be used. When more thanabout five per cent.

is used the bricks are not so refractory, and

when less is used they are more liable to expand at high temperatures.

-1 am aware that a com pound ofabout ninetyfive parts of silica and five parts of lime, with water, has been before used to make fire-brick of, and do not claim that compound.

Having thus described my invention, what 1 claim, and desire to secure by Letters Patent, 1s-

The com ound for furnace-linin s and fire- .brick,consistingof silica, magnesia, and water,

as specified and set forth. 1

JAMES HENDERSON. Witnesses:

E. M. BLANGHARD, J. IRWIN HAGERMAN. 

